To Be or Not to Be ShakespeareThe theory that William Shakespeare (1564-1616), an actor and grain dealer from Stratford-upon-Avon, was not actually the author of the plays attributed to him has been kicking around for centuries. The so-called anti-Stratford case has had no dearth of celebrity supporters, from Mark Twain and Sigmund Freud to the Shakespearean actors Derek Jacobi and Mark Rylance -…